1218916446 has 16 divisors (see below), whose sum is σ = 2659454208. Its totient is φ = 369368600.

The previous prime is 1218916411. The next prime is 1218916463. The reversal of 1218916446 is 6446198121.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 1218916398 and 1218916407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9234150 + ... + 9234281.

It is an arithmetic number, because the mean of its divisors is an integer number (166215888).

Almost surely, 2^1218916446 is an apocalyptic number.

1218916446 is an abundant number, since it is smaller than the sum of its proper divisors (1440537762).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1218916446 is a wasteful number, since it uses less digits than its factorization.

1218916446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18468447.

The product of its digits is 82944, while the sum is 42.

The square root of 1218916446 is about 34912.9839171618. The cubic root of 1218916446 is about 1068.2132950108.

The spelling of 1218916446 in words is "one billion, two hundred eighteen million, nine hundred sixteen thousand, four hundred forty-six".